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Chris Messina suggested using hashtags on Twitter. The number sign or hash symbol, #, has long been used in information technology to highlight specific pieces of text. In 1970, the number sign was used to denote immediate address mode in the assembly language of the PDP-11 [12] when placed next to a symbol or a number, and around 1973, '#' was introduced in the C programming language to ...
The symbol # is known variously in English-speaking regions as the number sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .
The second is a link to the article that details that symbol, using its Unicode standard name or common alias. (Holding the mouse pointer on the hyperlink will pop up a summary of the symbol's function.); The third gives symbols listed elsewhere in the table that are similar to it in meaning or appearance, or that may be confused with it;
Hash mark (sports), a marking on hockey rinks and gridiron football fields; Hatch mark, a form of mathematical notation; Number sign (#), also known as the hash, hash mark, or (in American English) pound sign; Service stripe, a military and paramilitary decoration; Tally mark, a counting notation; Checkmate symbol in chess
Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system . They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate results need to be erased or discarded.
On Wikipedia, a number sign, hash sign, pound sign or hashtag (#) may refer to one of the following uses: Number signs used in wiki markup. Number signs used to create ordered lists; Number signs used to link to a section of a page; Due to technical restrictions, number signs are not allowed in page titles.
A hash function that allows only certain table sizes or strings only up to a certain length, or cannot accept a seed (i.e. allow double hashing) is less useful than one that does. [citation needed] A hash function is applicable in a variety of situations. Particularly within cryptography, notable applications include: [8]
Hash key may refer to: Number sign , also known as the number, pound or hash key, a key on a telephone keypad For its use in data structure, database and cryptographic applications, see hash function or unique key